Ruler



FIG. 1 is a front elevational view of a ruler showing my new design;

FIG. 2 is a left side edge view thereof;

FIG. 3 is a right side edge view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view of a second embodiment showing my new design of FIGS. 1-4; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a ruler, as shown and described. 